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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7078643 | Capacitor switch with internal retracting impedance contactor A capacitor switch including a power contactor and an impedance contactor located within a relatively slender container filled with dielectric gas. The container may be a “dead tank” or an insulator. For the insulator configuration, the switch also includes a co... | 07/18/2006 |
| 6091040 | Outdoor high-voltage power circuit breaker The invention concerns an open air high-voltage circuit breaker comprising a circuit breaker unit (13) and a control capacitor connected electrically in parallel to it and surrounded by a common composite isolation housing (7, 8) made essentially of plast... | 07/18/2000 |
| 6091039 | Gas-insulated line with an incorporated power capacitor and circuit breaker The gas-insulated line comprises a conductor (1A) disposed inside a case (3A) filled with a dielectric gas under pressure. A power capacitor (5) is electrically connected to the conductor while being disposed inside a compartment (3P) secured to the case ... | 07/18/2000 |
| 5668360 | Circuit-breaker having two interrupting chambers per pole with drive mechanism and drive rods isolating insert capacitors A circuit-breaker having two interrupting chambers per pole, the chambers being disposed in a T or V configuration at the end of a column provided at its base with a control system for operating a drive rod, each chamber containing a moving assembly conne... | 09/16/1997 |
| 5266758 | SF6 circuit breaker having an incorporated capacitor A high tension circuit breaker includes a gastight cylindrical insulating case filled with SF6 gas or the like and defining for each phase at least one current interrupting chamber. A fixed main contact and a fixed arcing contact are fixedly mo... | 11/30/1993 |
| 5264671 | Varistor inserter device for a high-voltage circuit-breaker A device for temporarily inserting an electrical component such as a varistor connected to a contact arm carrying a metal contact ring in parallel with the contact of a circuit-breaker comprises a small diameter metal tube mechanically joined and electric... | 11/23/1993 |
| 5235147 | SF6 circuit-breaker incorporating both a varistor and a capacitor A high tension circuit-breaker has an insulating case filled with a dielectric gas such as SF6. A high capacitance capacitor and at least a varistor are electrically interconnected in parallel and are connected to a first terminal. The capacito... | 08/10/1993 |
| 5039831 | Circuit breaker In a circuit breaker in which an interrupting device, a resistor device and a capacitor device are connected in parallel, a shield device is arranged to shield the interrupting device and the resistor device and comprises a first shield for shielding the ... | 08/13/1991 |
| 4492835 | Load interrupter device A load interrupter device has a plurality of load interrupter contacts enclosed respectively in axially aligned vacuum bottles, each bottle containing a fixed contact and a second contact movable axially away from the fixed contact to open position and to... | 01/08/1985 |
| 4434333 | Circuit breaker device A circuit breaker having main contacts in parallel with resistive contacts. Upon closing, the resistive contacts close before the main contacts to suppress switching overvoltages. A resistor is positioned between the resistive contacts so that heat may be... | 02/28/1984 |
| 4434332 | Hybrid-type interrupting apparatus A current interruption apparatus comprises a series-connected combination of at least one vacuum interrupter and at least one gas-blast interrupter. Each vacuum interrupter is coupled in parallel with a non-linear resistor, while each gas-blast interrupte... | 02/28/1984 |
| 4239948 | Grounded support tank type gas circuit breaker A grounded support tank type gas circuit breaker comprising a cylindrical tank maintained at ground potential and filled with an arc-extinguishing gas, and a breaking unit disposed within the tank with its central axis extending along the axis of the tank... | 12/16/1980 |
| 4027123 | Vacuum circuit breaker comprising series connected vacuum interrupters and capacitive voltage-distribution means This circuit breaker comprises a plurality of vacuum interrupters electrically connected in series. The voltage distribution across the interrupters is controlled by a plurality of capacitive circuits respectively connected across the interrupters. Each o... | 05/31/1977 |
